CSI: Miami's executive producer Barry O'Brien explained: "We meet her in the course of searching for this missing fugitive and she appears as another possible witness, maybe a possible suspect.

"We bring her in for an interrogation and she reveals that she's actually an undercover agent for the Secret Service."

O'Brien also revealed that Renee may become a love interest for Horatio (David Caruso), saying: "It's a relationship we'd like to pursue. She's beautiful and she looks great with David. It's a pretty exciting relationship for us."

Henstridge will appear in the season nine finale and the season ten premiere of CSI: Miami and could become a recurring character despite her Secret Circle role.

"She booked a CW pilot, which is CBS family, so it's a doable scenario," O'Brien explained.